CN114006421B - Rapid reactive power control method and system for wind turbine group - Google Patents
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a rapid reactive power control method and a rapid reactive power control system for a wind turbine group, wherein the control method comprises the following steps: collecting wind turbine data; storing the wind turbine generator data in a data pool by a safety lock mechanism; acquiring wind turbine data from a data pool and mapping the wind turbine data into data required by reactive power control so as to generate a reactive power distribution instruction; storing reactive allocation instructions in a data pool in a secure lock mechanism; and acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine so as to control the reactive power state of the wind turbine. Generating a reactive power distribution instruction through the wind turbine generator data and mapping the wind turbine generator data into data required by reactive power control; and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator to control the reactive power state of the wind turbine generator. The reactive state of the fan can be adjusted timely and quickly, and no action loss exists. The high coupling method saves the time consumed by the system in the data transmission and data storage processes.
Description
Technical Field
The invention belongs to the field of reactive power control of wind power plants, and particularly relates to a rapid reactive power control method and system for a wind power generator group.
Background
The existing wind farm reactive power control method in the market is numerous, but the existing method mainly focuses on the accuracy and speed of algorithm control from the control algorithm point of view, and lacks the capability of carrying out collusion from the whole layout; meanwhile, due to the rapid adjustment capability of the SVG system, a plurality of control systems take the SVG system as a backup adjustment means, and the SVG system is considered to be adjusted to be good or bad, so that the SVG system cannot cause too large system deviation, and due to the rapid and accurate SVG adjustment function, the existing system lacks the power for active lifting optimization, but the SVG adjustment is realized on the basis of the self-electricity consumption of a wind field, and the action loss of the SVG consumes a large amount of electric energy.
Disclosure of Invention
The invention aims to provide a rapid reactive power control method and system for a wind turbine group, which are used for solving the problem of large action loss of SVG in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a rapid reactive power control method for a wind turbine group, which comprises the following steps:
collecting wind turbine data;
storing the wind turbine generator data in a data pool by a safety lock mechanism;
acquiring wind turbine generator data from the data pool and mapping the wind turbine generator data into data required by reactive power control so as to generate a reactive power distribution instruction;
storing the reactive allocation instructions in a data pool in a secure lock mechanism;
and acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine so as to control the reactive power state of the wind turbine.
Optionally, the method further comprises the steps of: collecting current and voltage signals of grid connection points of the wind turbine generator, and judging whether the reactive power actual value of the wind power plant is within a target value error range according to the current and voltage signals; and if the reactive power control command is not in the target value error range, adjusting the reactive power control command until the actual reactive power value of the wind power plant is in the target value error range.
Optionally, the wind turbine generator data and reactive power distribution instructions are stored in a data pool by a safety lock mechanism, and the specific mode is as follows: the wind turbine generator data can only be read and cannot be modified; the reactive allocation instructions can only be modified and cannot be read by the reactive control.
Optionally, channels for collecting data of the wind turbine generator and issuing reactive power distribution instructions to the wind turbine generator are mutually independent.
Optionally, the specific way of generating the reactive power distribution instruction is as follows:
acquiring a voltage target value of reactive power regulation of the wind turbine;
according to the voltage target value and the actual voltage value of reactive power regulation of the wind turbine generator system, an error value is obtained;
multiplying the feedforward coefficient by the error value to obtain a calculated error value;
and performing proportion calculation and integral calculation according to the calculated error value to obtain a final optimized reactive power distribution instruction.
Optionally, after obtaining the final optimized reactive power distribution instruction, issuing the reactive power distribution instruction to each wind turbine.
Optionally, the feedforward coefficient is obtained as follows:
when the absolute value of the error value err of the voltage target value and the actual voltage value is greater than the boundary value Qb, the feedforward coefficient K er Set to 1; when the absolute value of the error value err is less than or equal to the boundary value Qb, the feedforward coefficient K er Set as the ratio of the absolute value of the error value err to the boundary value.
Optionally, after obtaining the final optimized reactive power distribution instruction, issuing the reactive power distribution instruction to each wind turbine generator in a weighted distribution mode.
Optionally, the weighting distribution method comprises the following steps:
taking the sum of the total voltages of all the wind turbines as a reference, taking the actual voltage value of the current wind turbine as a reference, dividing the actual voltage value of the current wind turbine by the sum of the total voltage values of all the wind turbines, and taking the divided actual voltage value of the current wind turbine as the voltage distribution weight value of the current wind turbine.
In a second aspect of the present invention, a system for a fast reactive power control method for a wind farm includes:
the data transmission module is used for acquiring the data of the wind turbine generator; issuing reactive control instructions to the wind turbine to control the reactive state of the wind turbine;
the safety lock data pool module is used for storing the wind turbine generator data in a data pool by a safety lock mechanism; storing the reactive allocation instructions in a data pool in a secure lock mechanism;
the memory data mapping module is used for acquiring wind turbine generator data from the data pool, mapping the wind turbine generator data into data required by reactive power control, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator;
and the reactive power control algorithm module is used for generating reactive power distribution instructions.
The beneficial effects of the invention are as follows:
1. according to the rapid reactive power control method for the wind turbine group, the reactive power distribution instruction is generated through the data of the wind turbine group and mapping the data into the data required by reactive power control; and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator to control the reactive power state of the wind turbine generator. The reactive state of the fan can be adjusted timely and quickly, and no action loss exists. The high coupling method saves the time consumed by the system in the data transmission and data storage processes.
2. According to the rapid reactive power control method for the wind turbine group, wind turbine data are stored in a data pool through a safety lock mechanism, and reactive power distribution instructions are stored in the data pool through the safety lock mechanism; and data protection is carried out to prevent data tampering.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a flowchart of a method for fast reactive power control of a wind turbine group according to an embodiment of the invention.
Fig. 2 is a reactive instruction generation diagram in an embodiment of the present invention.
Fig. 3 is a schematic diagram of a fast reactive power control system for a wind turbine group according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
The invention aims to provide a rapid reactive power control method and a rapid reactive power control system for a wind turbine group, wherein a data transmission module, a reactive power control algorithm module and a memory data mapping module are highly coupled together in the calculation process of a control algorithm, and the whole process from bottom data acquisition to control algorithm calculation to control instruction issuing is completed in a memory. The method is suitable for the field of reactive power control of wind power plants, and achieves rapid control of nonfunctional power of the wind turbine generator.
As shown in fig. 1, in a first aspect of the present invention, a method for fast reactive power control of a wind turbine group is provided, including the following steps:
s1, collecting wind turbine generator data;
s2, storing the wind turbine generator data in a data pool by a safety lock mechanism; the specific method is as follows: the wind turbine generator data can only be read and cannot be modified; the reactive allocation instructions can only be modified and cannot be read by the reactive control.
In order to ensure the high-efficiency interaction of the data, a data pool adopts a safety lock mechanism to protect the data and prevent the data from being tampered; the data pool is divided into two parts of data, wherein one part is a fan information acquisition data unit and the other part is a fan lower control information data unit; the reactive power control algorithm module only can acquire the data of the elements in the unit, the fan information acquisition data unit cannot be modified, and meanwhile, the fan lower control information data unit has modification permission but cannot be read.
S3, acquiring wind turbine generator data from the data pool and mapping the wind turbine generator data into data required by reactive power control so as to generate a reactive power distribution instruction;
the specific mode for generating the reactive power distribution instruction is as follows:
acquiring a voltage target value of reactive power regulation of the wind turbine; according to the voltage target value and the actual voltage value of reactive power regulation of the wind turbine generator system, an error value is obtained; multiplying the feedforward coefficient by the error value to obtain a calculated error value; and performing proportion calculation and integral calculation according to the calculated error value to obtain a final optimized reactive power distribution instruction. And after obtaining the final optimized reactive power distribution instruction, issuing the reactive power distribution instruction to each wind turbine generator in a weighted distribution mode.
The feedforward coefficient is obtained as follows:
under the condition of fully considering the quick response capability of the reactive compensation equipment of the wind power plant, the whole control process is completed by adopting an algorithm model of controlling the reactive compensation equipment by using a boundary value and matching with proportional control and integral control.
The feedforward coefficient value is determined mainly by setting a boundary value during the feedforward control, and when the absolute value of the error value err of the voltage target value and the actual voltage value is greater than the boundary value Qb, the feedforward coefficient K er Set to 1; when the absolute value of the error value err is less than or equal to the boundary value Qb, the feedforward coefficient K er The absolute value of error value err is set as the ratio of the boundary value, and the formula is as follows:
after the feedforward coefficient is calculated, multiplying the feedforward coefficient by the current error value err1 to obtain a calculated error value err, and then completing the processes of proportion calculation and integral calculation by utilizing the calculated error value err to finally output a reactive power instruction value, wherein Kp and Ki are constant coefficients;
err＝err1*Ker；
and S4, storing the reactive power distribution instruction in a data pool in a safety lock mechanism.
S5, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine so as to control the reactive power state of the wind turbine. Collecting current and voltage signals of grid connection points of the wind turbine generator, and judging whether the reactive power actual value of the wind power plant is within a target value error range according to the current and voltage signals; and if the reactive power control command is not in the target value error range, adjusting the reactive power control command until the actual reactive power value of the wind power plant is in the target value error range.
When the voltage instruction of each fan is distributed, the assigned weight distribution is adopted, and the assigned weight distribution method comprises the following steps:
the weighting distribution is mainly based on the sum of the total voltages of all fans of the line, the actual voltage value of the current fan is used as a reference, and the sum of the actual voltage value of the current fan divided by the total voltage value of all fans is the voltage distribution weighting value of the current fan.
When reactive power distribution is carried out, the current reactive power of the fan is judged according to the data of wind speed, active power of the fan, state of the fan, reactive power of the fan and the like, and actual distribution is carried out according to nonfunctional power. As an example, for example, when the current wind turbine generator is in a shutdown state, the reactive power of the current wind turbine generator is zero, and reactive power distribution is not performed, and other examples are not described herein. The wind speed, the active power of the fan, the state of the fan, the reactive power of the fan and other data are also obtained from a data pool, and the data points in the data pool comprise the wind speed point of the fan, the active power point of the fan, the reactive power feedback point of the fan, the state point of the fan, the reactive power control point of the fan, the voltage signal point of the grid-connected point, the current signal point of the grid-connected point and other data.
As an optional embodiment of the invention, channels for collecting the data of the wind turbine generator and sending reactive power distribution instructions to the wind turbine generator are mutually independent, and a separate operation mechanism is adopted for uploading and downloading the data.
In a second aspect of the present invention, a fast reactive power control system for a wind farm includes:
the data transmission module is used for acquiring the data of the wind turbine generator; issuing reactive control instructions to the wind turbine to control the reactive state of the wind turbine; the system is mainly responsible for communication with the wind turbine generator set, and the system is mainly used for data interaction with the reactive power control algorithm module through the safety lock data pool module, the memory data mapping module and the reactive power control algorithm module, so that the acquisition and control functions of the wind turbine are realized.
The safety lock data pool module is used for storing the wind turbine generator data in a data pool by a safety lock mechanism; storing the reactive allocation instructions in a data pool in a secure lock mechanism; the data obtained in the data transmission module is stored in the safety lock data pool module, then the data is directly mapped with the input quantity participated in calculation in the reactive control algorithm module through the memory data mapping module, meanwhile, the calculation result parameter in the reactive control algorithm module is interacted with the safety lock data pool module through the memory data mapping module, and then the data is mapped with the issued control point variable in the data transmission module, and the high-speed real-time performance of the data in the flow processing process is realized through the high-coupling performance.
The memory data mapping module is used for acquiring wind turbine generator data from the data pool, mapping the wind turbine generator data into data required by reactive power control, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator; and establishing a direct mapping relation between the data of the wind turbine side and the reactive power control algorithm module as a medium. The memory mapping module is mainly responsible for completing the establishment of the mapping relation between the data transmission module and the reactive control algorithm module and the mapping verification work so as to ensure the establishment of the mapping relation and the normal of the mapping channel, when the data transmission module and the reactive control algorithm module carry out data transmission, the data transmission module and the reactive control algorithm module adopt one-to-one corresponding transmission relation, the variable names and the variable data types on two sides are required to be completely unified, and the actual meanings represented by the variables are also completely consistent.
And the reactive power control algorithm module is used for generating reactive power distribution instructions.
The grid-connected point signal acquisition module is mainly used for completing current and voltage signal acquisition of grid-connected points of the wind field so as to detect whether the reactive power change condition of the whole field in the adjusting process reaches a target value.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (8)
1. A system for a fast reactive power control method for a wind farm, comprising:
the data transmission module is used for acquiring the data of the wind turbine generator; issuing reactive control instructions to the wind turbine to control the reactive state of the wind turbine; the data transmission module is communicated with the wind turbine generator, and performs data interaction with the reactive power control algorithm module through the safety lock data pool module and the memory data mapping module to realize the acquisition and control functions of the wind turbine;
the reactive power control algorithm module is used for generating reactive power distribution instructions;
the safety lock data pool module is used for storing the wind turbine generator data in a data pool by a safety lock mechanism; storing the reactive allocation instructions in a data pool in a secure lock mechanism; the data obtained by the data transmission module is stored in the safety lock data pool module, and a one-to-one mapping relation is directly formed between the memory data mapping module and the input quantity participating in calculation in the reactive power control algorithm module; the calculation result parameters in the reactive power control algorithm module are subjected to data interaction with the safety lock data pool module through the memory data mapping module, and then form a one-to-one mapping relation with the issued control point variables in the data transmission module;
the memory data mapping module is used for acquiring wind turbine generator data from the data pool, mapping the wind turbine generator data into data required by reactive power control, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator; the memory mapping module is used for establishing the mapping relation between the data transmission module and the reactive control algorithm module and performing mapping verification so as to ensure the establishment of the mapping relation and the normal of the mapping channel, when the data transmission module and the reactive control algorithm module perform data transmission, the data transmission module and the reactive control algorithm module adopt one-to-one corresponding transmission relation, the variable names and the variable data types on two sides are completely unified, and the actual meanings represented by the variables are also completely consistent.
2. The system for a fast reactive power control method for a wind farm according to claim 1, wherein the wind turbine data and reactive power distribution instructions are stored in a data pool in a safety lock mechanism by: the wind turbine generator data can only be read and cannot be modified; the reactive allocation instructions can only be modified and cannot be read by the reactive control.
3. The system for a fast reactive power control method for a wind farm according to claim 1, wherein the channels for collecting wind turbine data and issuing reactive power distribution instructions to the wind turbine farm are independent of each other.
4. The system for a fast reactive power control method for a wind farm according to claim 1, wherein the specific way of generating reactive power distribution instructions is:
acquiring a voltage target value of reactive power regulation of the wind turbine;
according to the voltage target value and the actual voltage value of reactive power regulation of the wind turbine generator system, an error value is obtained;
multiplying the feedforward coefficient by the error value to obtain a calculated error value;
and performing proportion calculation and integral calculation according to the calculated error value to obtain a final optimized reactive power distribution instruction.
5. The system for a fast reactive power control method for a wind farm according to claim 4, wherein after obtaining the final optimized reactive power distribution instruction, the reactive power distribution instruction is issued to each wind turbine.
6. The system for a fast reactive power control method for a wind farm according to claim 4, wherein the feedforward coefficient is obtained as follows:
when the absolute value of the error value err of the voltage target value and the actual voltage value is greater than the boundary value Qb, the feedforward coefficient er Set to 1; when the absolute value of the error value err is less than or equal to the boundary value Qb,feedforward coefficient-> er Set as the ratio of the absolute value of the error value err to the boundary value.
7. The system for a fast reactive power control method for a wind turbine farm according to claim 5, wherein after obtaining the final optimized reactive power distribution instruction, issuing the reactive power distribution instruction to each wind turbine in a weighted distribution manner.
8. The system for a fast reactive power control method for a wind farm according to claim 7, wherein the weighting allocation method is:
taking the sum of the total voltages of all the wind turbines as a reference, taking the actual voltage value of the current wind turbine as a reference, dividing the actual voltage value of the current wind turbine by the sum of the total voltage values of all the wind turbines, and taking the divided actual voltage value of the current wind turbine as the voltage distribution weight value of the current wind turbine.
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| CN108879685A (en) * | 2018-08-09 | 2018-11-23 | 安徽亚辉电气自动化有限公司 | A kind of control method of Active Power Filter-APF |
| CN109256783A (en) * | 2018-11-30 | 2019-01-22 | 国网山东省电力公司经济技术研究院 | A kind of voltage control method for coordinating of distributing wind power integration mixing power distribution network |
| CN110350592A (en) * | 2019-06-03 | 2019-10-18 | 南京国电南自电网自动化有限公司 | A kind of fast frequency responding power control system and method |
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